Buckle



FIG. 1 is a perspective view showing my new design for a buckle;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a back elevation view thereof;

FIG. 5 is a left elevation view thereof;

FIG. 6 is a right elevation view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line showing in FIGS. 1-4 and 7 is for illustrative purposes only and forms no part of the claimed design. 

I claim the ornamental design for a buckle, as shown and described. 